In the USA, near Washington, DC, a computer has been accused of failing and allowing two trains (like subways) to collide, killing 9.
computers, HA.
This is incorrect - the
sensor in one section of track failed to report that a train happened to be occupying the track, hence the computer system did not "know" there was anything to slow down for.
Sure there are a number of questions (like "why, if the system knew there was a train passing through the preceding sections of track, did the system not question where that train went...?").
Different topic, but similar. A computer can only react to the data presented (or not presented), and the trick is provide some level of useful behavior when any one one piece (or more) of data (for whatever reason) is not available.
-GY